Update internal state when iface is removed.

Bug: 5433432
Change-Id: I7eb0ffe3ae07f42d5c47fe4082f490478c5099bf

Author: jsharkey

services/java/com/android/server/NetworkManagementService.java

@@ -238,6 +238,11 @@ private void notifyInterfaceAdded(String iface) {
      * Notify our observers of an interface removal.
      */
     private void notifyInterfaceRemoved(String iface) {
+        // netd already clears out quota and alerts for removed ifaces; update
+        // our sanity-checking state.
+        mActiveAlertIfaces.remove(iface);
+        mActiveQuotaIfaces.remove(iface);
+
         for (INetworkManagementEventObserver obs : mObservers) {
             try {
                 obs.interfaceRemoved(iface);